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Leveling plane sets all feature 3mm out in alignment.

PaulBigley
Iterative Alignment
Level -- 3 surface points to "Z"
Rotate -- Hole /Slot
Origin -- Hole

The issue I have is that all features are out in "z" 3mm. (the 3 leveling point check good, 0.00mm)
I added a 4th surface point to the "z" plane and did a second iterative alignment using two holes and a slot for my leveling points. Now all features check good, including the 4th surface point but the original three surface points check 3mm out.

I have re- certified my probe tip and rerun with the same issue. I find no offsets and my tip comp is on. PC-DMIS CAD++2017R2. Any idea what could cause this issue?
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  • in reply to PacMan23
    IF the comp was being done in the wrong direction, it would be off the probe diameter, which is the 3mm you are seeing. (but it's Friday, maybe that isn't it).

    For a point with the PROPER nominals and vectors, you must have the probe pointed MORE towards the part than away from the part. Now, without an alignment, picking points from a CAD model can be a bugger as it has no idea which side you are actually trying to probe from. When working on a CMM, when picking points from the model, if the probe is A0B0 and the surface you are picking from has a vector with NO Z (K vector), it is hit and miss which way it will decide the vector goes. If those 3 points you initially used have a flipped vector, that would be the entire problem.
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  • in reply to PacMan23
    IF the comp was being done in the wrong direction, it would be off the probe diameter, which is the 3mm you are seeing. (but it's Friday, maybe that isn't it).

    For a point with the PROPER nominals and vectors, you must have the probe pointed MORE towards the part than away from the part. Now, without an alignment, picking points from a CAD model can be a bugger as it has no idea which side you are actually trying to probe from. When working on a CMM, when picking points from the model, if the probe is A0B0 and the surface you are picking from has a vector with NO Z (K vector), it is hit and miss which way it will decide the vector goes. If those 3 points you initially used have a flipped vector, that would be the entire problem.
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